Clock problem

[DDMM]

Hello everyone,
I have a problem with right-top corner clock.
System time is true but this clock shows wrong.
Current time is 21:53 clock shows 11:51 right now.
Regards.

[MarlonUk1]

is it the same when you are on safe mode?

try to perform a software repair using Xperia COmpanion

[Nervous]

I had the same problem. Also my alarm clock hadn't work properly. It disappeared one day (probably after software update).

[Mr-samar]

The same problem was in my phone but when turnedoff Automatic date & time and Automatic time zone,this is now removed.You may try it.

[Goobie]

I have the same problem, it started happening after Android 6 upgrade. I tried all the advice above, but still the clock will not keep time. Very frustrating